I got these new Avent level 4 nipples and they work just as well as the old version. They clean just as easily. The key difference to me is that the new nipples incorporate or rather do not require the ring that was needed on the old version. To me, this means one less item to wash, and one less item to place onto the bottle (on the old version, if you do not use the ring, it would cause leaks). Thats a significant improvement. This is a good product and I would highly recommend it.
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